As a good friend of his, I offered Tom my congratulations ______ his passing the college entrance exams.
| A．at | B．on | C．for | D．of |
When _____ help, one often says “Thank you.” or “it’s kind of you”
| A．offering | B．to offer | C．to be offered | D．offered |
He narrowly escaped _______ by the falling tree.
| A．to be injured | B．being injured | C．injuring | D．having injured |
_____ is known to us all, a skill can only be acquired through hard work.
| A．It | B．As | C．What | D．That |
There is no doubt _____ short sight is a serious problem among the youth of our country.
| A．which | B．whether | C．what | D．that |
From the deep valley ______, which had my heart in my mouth.
| A．came a frightening sound | B．a frightening sound came there |
| C．did a frightening sound come | D．a frightening sound did come |